#define PIR_PIN 2
#define LED_PIN 4

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  int pirValue = digitalRead(PIR_PIN);
  if (pirValue == HIGH) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Motion detected!");
  } else {
    digitalWrite(LED_PIN, LOW);
    Serial.println("No motion.");
  }
  delay(1000);
}